한국과학기술원 Korea Advanced Institute of Science and Technology
등록번호
TRKO200200013334
DB 구축일자
2013-04-18
키워드
DNA polymerase.DNA excision.aphidicolin.DNA polymerase.DNA excision.aphidicolin.
초록
포유동물에서 DNA 중합효소들의 핵산 회복에 미치는 영향을 검토하였다. DNA polymerase alpha 는 절단부위가 큰 DNA 손상이 유발되는 DNA 회복합성에서 초기의 합성단계를 담당하는 중요 효소로 밝혀졌으며, beta 효소는 후기에 잔여 절단 부위를 메꾸는 역할을 하는 것으로 밝혀졌다. 한편, DNA polymerase alpha 효소가 뉴클레오티드를 중합하는 과정과 절단하는 과정과는 밀접한 연관 관계가 있음이 효소의 활성 저해제를 사용한 실험에서 밝혀졌다. DNA 손상을 가져온 세포의 DNA polymerase alpha 효소는 활성도가 증가되었는데 그 생화학적 설명에 접근하려는 연구가 병행되었다.
Abstract
The ability of mammalian DNA polymerases to carry out DNA excision repair synthesis induced by long patch type DNA damage was examined. DNA polymerase alpha was the major enzymeresponsible for the resynthesis of DNA damage after endonuclease nicking step, while DNA poly beta carried out limited strand displacement. Exonuclease activities associated with DNA polymerase alpha activity were observed in UV damaged HeLa cells treated with aphidicolin. Following DNA damage, cellular level of DNA polymerase alpha was observed to be elevated. Biochemical mechanisms by which DNA polymerase alpha could be activated upon DNA damage were investigated.
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